Display screen or portion thereof with transitional graphical user interface



FIG. 1 is a first image in a sequence of a display screen or portionthereof with transitional graphical user interface showing my new designaccording to the first embodiment;

FIG. 2 is a second image thereof;

FIG. 3 is a third image thereof;

FIG. 4 is a fourth image thereof;

FIG. 5 is a first image in a sequence of a display screen or portionthereof with transitional graphical user interface showing my new designaccording to the second embodiment;

FIG. 6 is a second image thereof;

FIG. 7 is a third image thereof;

FIG. 8 is a fourth image thereof;

FIG. 9 is a first image in a sequence of a display screen or portionthereof with transitional graphical user interface showing my new designaccording to the third embodiment;

FIG. 10 is a second image thereof;

FIG. 11 is a third image thereof; and,

FIG. 12 is a fourth image thereof.

The outermost broken line showing of the display screen or portionthereof is for environmental purposes only and forms no part of theclaimed design.

The remaining broken lines in the figures depict portions of thetransitional graphical user interface which form no part of the claimeddesign.

The appearance of the transitional graphical user interface sequentiallytransitions between the images shown in FIGS. 1-4, FIGS. 5-8 and FIGS.9-12, respectively. The process or period in which one image transitionsto another forms no part of the claimed design.

CLAIM I claim the ornamental design for a display screen or portionthereof with transitional graphical user interface, as shown anddescribed.